How to compare strings/array? RFID Project

[Ioannis]

I do not know what the 0A is there for.

It for sure NOT for the ID-12.

In ASCII Hex mode,the ID-12 sends a STX (Start Sentinel) of 02 as the data sheet state.

So no WAIT(0Ah). It will give Bad Tag message.

On the e-mail I sent to you there was an error as I did not read correctly the Data Sheet.

Correct one is the

serin2 port_pin1,baud_rate1,[wait($02),str buf\10]
 
serout2 port_pin2,baud_rate2,[str buf\10,13,10]

just to test if the reading data are correct.

Ioannis

[astanapane]

for all our knowledge,

i would also like to know if the 12 digits i get from the usb reader, as sparkfun's video on their page...http://www.sparkfun.com/products/8419 is ASCII code.

It is needed first to understand what is this 12 digit number?

Thank you very much for your help. I need also to help you by understanding the basics. then might be easier for you to give me the right instructions.

[astanapane]

I do not know what the 0A is there for.

It for sure NOT for the ID-12.

In ASCII Hex mode,the ID-12 sends a STX (Start Sentinel) of 02 as the data sheet state.

So no WAIT(0Ah). It will give Bad Tag message.

On the e-mail I sent to you there was an error as I did not read correctly the Data Sheet.

Correct one is the

serin2 port_pin1,baud_rate1,[wait($02),str buf\10]
 
serout2 port_pin2,baud_rate2,[str buf\10,13,10]

just to test if the reading data are correct.

Ioannis

I will make the change to $02 this might solve the problem.

If not then i will try to figure out how to connect it to the computer thought the serial port to see what i get.

Can i do anything with the existing one i have (i mean the usb reader)?

Can i find out from there what the Module is generating?

Because i got consfused. With this reader i get a number throught the Secure CRT program with 12 digits.

[Gevo]

Hi,

I have a lot of applications done with RFID. See my web http://www.picshop.nl/rfid.html
Here connected to a AmiPIC18 board with the PIC18F25K20. The firmware is in PICBASIC Pro.

After reading a Tag, the reader give a Hex02. So, you have to wait for that character and store the next 10-byte in a string. Thats the Tag ID. If the first byte = 0, than you have a read only tag. (1 means read/write)
The OEM reader what I use, has a CP signal, this will be high after reading a Tag, then 210ms later, the reader wil send out (9600 baud) the TAG ID. I use in the firmware the CP signal to poll of a Tag is reading or not. The micro is run on 8 Mhz or faster to read 9600baud.

I will post tomorrow some firmware to show hows iets work if you want.

Regards,

[astanapane]

Dear Mr. Gevo,

thanks a lot for that. Mr. Ioannis gave me some information in order to start from, read and learn. So i need to read all these info and then i will come back with all my questions.

I think i'm close to fix the problem and make the circuit to work.

At the moment i have use 4Mhz resonator for 9600. Do you think that this might be a problem? I will change it to 8Mhz crystal then.

[Ioannis]

If the PIC send without any poblem to a PC then its OK for the 4MHz.

I have many times used 9600 on 628 with 4MHz resonator (not crystal) and went smooth.

Ioannis

[Bruce]

Why not just use DEBUG for transmit & DEBUGIN for receive?

These commands work 100% with a 4MHz oscillator up to 19200 bps, offer the same modifiers as SERIN2/SEROUT2, and produce much smaller code!

[Ioannis]

Bruce just cought me. These two commands would be the next step to suggest.

astanapane is struggling with the basics so I did not put him to code changes. Debug need DEFINES declared on top of the code.

Ioannis